|Table of Contents|

Influence of cyclic loading on shear properties of rock at filled structural face(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2025年1期
Page:
24-37
Research Field:
道路工程
Publishing date:

Info

Title:
Influence of cyclic loading on shear properties of rock at filled structural face
Author(s):
XU Xu-tang;  CHEN Xiang-long;  YANG Feng;  XIAN Zhen-xing;  XU Xiang
(College of Transportation and Civil Engineering, Fujian Agriculture and Forestry University,Fuzhou 350108, Fujian, China)
Keywords:
road engineering;  filled structural face;  cyclic loading;  undulation angle;  filling degree;  number of cyclic shears
PACS:
U411
DOI:
10.19721/j.cnki.1671-8879.2025.01.003
Abstract:
Aiming at the fatigue degradation characteristics of rock slopes on mountainous roads under dynamic loads, a study was conducted on the shear characteristics of rock masses with filled structural planes under cyclic loads, a self-made rock direct shear instrument and an automated collection system were used to design and conduct direct shear tests on the rock mass. The stress-strain curve developments and strength evolution characteristics of rock masses filled with structural planes under different undulation angles and filling degrees were analyzed, and the average shear expansion angle was used to characterize the impacts of undulation angle and filling degree on the shear properties of rock mass filled with structural planes. The results show that thestress displacement curves are mainly peakless at small undulation angles, while the unfilled and filled structural faces with large undulation angle is dominated by steep-peak curve and slow peak-curve, respectively, and the uplifted curves mainly appear at high undulation angles and high filling degrees. As the fluctuation angle increases, the peak shear strength of the structural face gradually increases due to the increase in shear damage, and shows the characteristics of strong shear contraction and weak shear expansion. With the increase in the filling degree, the peak shear strength of the rock at structural face and its difference both decrease, and the shear expansion characteristics are not obvious due to the significant compression-density effect of the filling layer during the cyclic shear process. Both the peak shear stress and the average shear expansion angle of the rock at structural face decrease with the increase in the number of cyclic shears and gradually stabilize, and the wear of the structural face also gradually decreases. When the filling degree is greater than 1, the decrease in the average shear expansion angle is mainly caused by the wear of the structural face and the extrusion of the filling material. When the filling degree is less than 1, the decrease in the average shear expansion angle is caused by shear and sliding wear of the structural face. The results can provide references for the long-term safety, stability, and durability evaluation of mountainous road rock slopes under cyclic loading.1 tab, 21 figs, 28 refs.

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Last Update: 2025-02-25